CS22892-052 (star)

Information about CS22892-052 (star)

BPS CS22892-0052
Observation data
Epoch J2000
ConstellationAquarius
Right ascension22h 17m 01.5s
Declination-16° 39' 26"
Apparent magnitude (V)13.2
BPS CS22892-0052 (Sneden's Star) is an old Population II star located at a distance of 4.7 kpc in the Galactic Halo. It belongs to a class of ultra-metal-poor stars (Metallicity [Fe/H]=-3.1) , especially the very rare subclass of neutron-capture (r-process) enhanced stars. It was discovered by Tim C. Beers and collaborators with the Curtis Schmidt telescope at the Cerro Tololo Inter-American Observatory in Chile. Extended high-resolution spectroscopic observations since around 1995 (with Chris Sneden from the University of Texas at Austin as the leading observer) allowed observers to determine the abundances of 53 chemical elements in this star, as of December 2005 only second in number to the Sun.

From Barium (Z=56) on, all elements show the pattern of the r-process contribution to the abundances of the elements in the Solar system. Comparing the observed abundances for a stable element such as Europium (Z=63) and the radioactive element Thorium (Z=90) to calculated abundances of an r-process in a type II supernova explosion (as from the universities at Mainz and Basel groups of Karl-Ludwig Kratz and Friedrich-Karl Thielemann) allowed observers to determine the age of this star to about 13 billion years. Similar ages have been derived for other ultra-metal-poor stars (CS31082-001, BD+17° 3248 and HE 1523-0901) from Thorium to Uranium ratios.

References

  • BEERS T.C., PRESTON G.W., SHECTMAN S.A., A search for stars of very low metal abundance. I., Astron. J., 90, 2089-2102 (1985)
  • BEERS T.C., PRESTON G.W., SHECTMAN S.A., A search for stars of very low metal abundance. II., Astron. J., 103, 1987-2034 (1992)
  • Kratz, Karl-Ludwig; Bitouzet, Jean-Philippe; Thielemann, Friedrich-Karl; Moeller, Peter; Pfeiffer, Bernd, Isotopic r-process abundances and nuclear structure far from stability - Implications for the r-process mechanism, Astrophysical Journal, vol. 403, no. 1, p. 216-238 (1993)
  • Sneden, Christopher; McWilliam, Andrew; Preston, George W.; Cowan, John J.; Burris, Debra L.; Armosky, Bradley J., The Ultra--Metal-poor, Neutron-Capture--rich Giant Star CS 22892-052, Astrophysical Journal v.467, p.819 (1996)
  • Cowan, John J.; Pfeiffer, B.; Kratz, K.-L.; Thielemann, F.-K.; Sneden, Christopher; Burles, Scott; Tytler, David; Beers, Timothy C., R-Process Abundances and Chronometers in Metal-poor Stars The Astrophysical Journal, Volume 521, Issue 1, pp. 194-205 (1999)

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Please [improve the article] or discuss this issue on the talk page. This article has been tagged since August 2007.
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constellation of Orion is the area outlined in the dashed yellow line. Orion contains a striking and well-known star pattern that has the form of a hunter.]] A constellation is any one of the 88 areas into which the sky — or the celestial sphere — is divided.
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Aquarius

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List of stars in Aquarius
Abbreviation: Aqr
Genitive: Aquarii
Symbology: the Water-bearer
Right ascension: 23 h
Declination: −15
Area: 980 sq. deg.
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Right ascension (abbrev. RA; symbol α) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.
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In astronomy, declination (abbrev. dec or δ) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle.
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The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.
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metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. (This terminology is used differently to the usual meaning of the word 'metal', since on the grandest of scales the universe is overwhelmingly composed of hydrogen
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STAR is an acronym for:

Organizations:
  • Society for Telescopy, Astronomy, and Radio, a non-profit astronomy club in New Jersey
  • Special Tasks and Rescue or Special Tactics and Response, synonyms for SWAT

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The term galactic halo is used to denote an extended, roughly spherical component of a galaxy, which extends beyond the main, visible component. It can refer to any of several distinct components which share these properties:
  • the galactic spheroid (stars)

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metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. (This terminology is used differently to the usual meaning of the word 'metal', since on the grandest of scales the universe is overwhelmingly composed of hydrogen
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metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. (This terminology is used differently to the usual meaning of the word 'metal', since on the grandest of scales the universe is overwhelmingly composed of hydrogen
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The r-process is a nucleosynthesis process occurring in core-collapse supernovae (see also supernova nucleosynthesis) responsible for the creation of approximately half of the neutron-rich atomic nuclei that are heavier than iron.
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A Schmidt camera is an astronomical camera designed to provide wide fields of view with limited aberrations. Other similar designs are the Wright Camera and Lurie-Houghton telescope.
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The Cerro Tololo Inter-American Observatory (CTIO, IAU code 807) is a complex of astronomical telescopes and instruments located at 30.169 S, 70.804 W, approximately 80 km to the East of La Serena, Chile at an altitude of 2200 metres.
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Motto
Por la Razón o la Fuerza
(Spanish: "By right or might")
Anthem
Himno Nacional de Chile
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Astronomical spectroscopy is the technique of spectroscopy used in astronomy. As spectroscopy is described in its own article, this article focuses on its use in astronomy.
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The University of Texas at Austin (often referred to as The University of Texas, UT Austin, UT, or Texas) is a doctoral/research university located in Austin, Texas.
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Barium (IPA: /ˈbɛːɹiəm/) is a chemical element. It has the symbol Ba, and atomic number 56. Barium is a soft silvery metallic alkaline earth metal.
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Europium (IPA: /jʊˈrəʊpiəm/) is a chemical element in the periodic table that has the symbol Eu and atomic number 63. It was named after the continent Europe.
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Thorium (IPA: /ˈθɔːriəm/) is a chemical element in the periodic table that has the symbol Th and atomic number 90.
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Johannes Gutenberg University of Mainz is an institute of higher education in Mainz, Rhineland Palatinate, Germany. With approximately 35,000 students (2007) in about 150 schools and clinics, it is among the top ten largest universities in Germany.
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The University of Basel (German: Universität Basel) is located at Basel, Switzerland.

History

Founded in 1459, it is Switzerland's oldest university.
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Karl-Ludwig Kratz (April 23, 1941 in Jena, Thuringia) is a German nuclear chemist and astrophysicist. He is professor for nuclear chemistry at the Johannes Gutenberg University of Mainz and adjunct professor of physics at the University of Notre Dame in South Bend, Indiana.
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BPS CS31082-0001 (Cayrel's Star) is an old Population II star located in a distance of 4 kpc in the Galactic Halo. It belongs to the class of ultra-metal-poor stars (Metallicity [Fe/H]=-2.9), especially the very rare subclass of neutron-capture enhanced stars.
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BD +17° 3248 is an old Population II star located in a distance of 272 pc in the Galactic Halo. It belongs to the class of ultra-metal-poor stars (Metallicity Fe/H=–3.1) , especially the very rare subclass of neutron-capture (r-process) enhanced stars.
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HE 1523-0901 is the designation given to a red giant star located in the Milky Way galaxy. It is thought to be a second generation Population II, or metal-poor, star ([Fe/H]=-2.95).
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Uranium (IPA: /jʊˈreɪniəm/)is a white/black metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92.
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The word Simbad can refer to one of the following:
  • Simbad, a two-missile launch unit for the Mistral anti-air defence missile.
  • SIMBAD, database of astronomical information.

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